/*
 * Copyright © 2015 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.cassandra.io.compress;

import com.google.common.util.concurrent.RateLimiter;

import java.io.FileNotFoundException;

/**
 * TODO: remove once guava removed from cdap-api
 * Copied from Cassandra to avoid guava conflicts from method signature change to RateLimiter.acquire(int x).
 */
public class CompressedThrottledReader extends CompressedRandomAccessReader {
  private final RateLimiter limiter;

  public CompressedThrottledReader(String file, CompressionMetadata metadata, RateLimiter limiter) 
    throws FileNotFoundException {
    super(file, metadata, null);
    this.limiter = limiter;
  }

  protected void reBuffer() {
    limiter.acquire(buffer.length);
    super.reBuffer();
  }

  public static org.apache.cassandra.io.compress.CompressedThrottledReader open(String file, 
                                                                                CompressionMetadata metadata, 
                                                                                RateLimiter limiter) {
    try {
      return new org.apache.cassandra.io.compress.CompressedThrottledReader(file, metadata, limiter);
    } catch (FileNotFoundException e) {
      throw new RuntimeException(e);
    }
  }
}
